Constraints on the superconducting state of Sr2RuO4 from elastocaloric measurements

  • Strontium ruthenate Sr2RuO4 is an unconventional superconductor whose pairing symmetry has not been fully clarified, despite more than two decades of intensive research. Recent NMR Knight shift experiments have rekindled the Sr2RuO4 pairing debate by giving strong evidence against all odd-parity pairing states, including chiral p-wave pairing that was for a long time the leading pairing candidate. Here, we exclude additional pairing states by analyzing recent elastocaloric measurements [YS. Li et al., Nature 607, 276--280 (2022)]. To be able to explain the elastocaloric experiment, we find that unconventional even-parity pairings must include either large dx2−y2-wave or large {dxz∣dyz}-wave admixtures, where the latter possibility arises because of the body-centered point group symmetry. These {dxz∣dyz}-wave admixtures take the form of distinctively body-centered-periodic harmonics that have horizontal line nodes. Hence gxy(x2−y2)-wave and dxy-wave pairings are excluded as possible dominant even pairing states.

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Metadaten
Author:Grgur PalleORCiD, Clifford HicksORCiD, Roser ValentíORCiDGND, Zhenhai HuORCiD, You-Sheng LiORCiD, Andreas Rost, Michael NicklasORCiD, Andrew P. MackenzieORCiD, Jörg SchmalianORCiDGND
URN:urn:nbn:de:hebis:30:3-824341
URL:https://arxiv.org/abs/2304.07182v1
DOI:https://doi.org/10.48550/arXiv.2304.07182
ArXiv Id:http://arxiv.org/abs/2304.07182v1
Parent Title (English):arXiv
Publisher:arXiv
Document Type:Preprint
Language:English
Date of Publication (online):2023/04/14
Date of first Publication:2023/04/14
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/02/20
Issue:2304.07182 Version 1
Edition:Version 1
Page Number:20
HeBIS-PPN:516154656
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0